Syringe



J. VALDERRAMA.

SYRINGE.

APPLICATION FILED APR. I6. 1919.

2 SHEETS-SHEET l.

Patented Mar. 8, 1921,

J. VALDERRAMA.

SYRINGE.

APPLICATION FILI-:D APII. I6, I9I9.

1,371,1 33, Patented Mar. 8, 1921.

2 SHEETS-SHEET 2.

UN'ITEHE 'EATES earsn'r oFF-1er..

JOS VALDERRAMA,

or MADRID, SPAIN.

stramien.

To all 'whom t Imay concern.'

Be it known that l, Jos Vanni-nannten, a subject of the King of Spain, residing in Madrid, Spain, have invented certain new and useful Improvements in Syringes, ot which the 'following is a specification.

This invention relates to improvements in syringes and has particular' reference to hypodermic syringes. t is known that in syringes of this kind it is diiiicult to withdraw the needles tor renewing or replacing them, more particularly when the said needles are of small cross-section.

The needle holder' which supports and secures the hollow needle, hitherto has been applied to the syringe either by directly screwing it on well 'or by means or' an ade itional part which takes the place of a connection or union and secures the needle holder to the end of the syringe.

In many cases, as in dental practice, it is necessary that the needles must be orq very small cross-section, and in order to secure them to the needle holder, they are provided at the top with a soit metal collar or disk which rests on the upper surface or crown of the needle holder, the said collar being compressed between the needle holder and the syringe, and at the same time a tight joint is formed which prevents the injection liquid from escaping.

lt frequently happens that the fragile needle breaks and in many cases such breaking occurs at the part which is in the interior of the needle holder; and owing to the pressure exercised between the syringe and the needle-holder, the collar remains jammed between them, more particularly on the screw-threaded port-ion of the needle-holder, it becomes a diiiicult operation to extract the stump of the needle that remains in the needle holder, it being sometimes necessary to heat the collar until it melts, with the resultant loss of time and deterioration of the needle holder.

The present invention has for its object to avoid these drawbacks, and to that end, by means of a simple arrangement oi a screw-thread between the needle-holder ferrule and the union nut, the upper part or crown of the former can be forced out of the union nut, so that the needle can be easily Specification of Letters Patent.

Fatented Mar. 8, 1921.

191e. serial-No. 290,495.

withdrawn for renewing it, without it being necessary to melt the collar.

A construction is illustrated in the accompanying drawing in which- Figure l is an elevation of a syringe with its needle-holder;

Fig. 2 is a longitudinal section of the syringe;

Fig. 3 is an elevation of the washer extractor;

Fig. l is a longitudinal section through the needle holder errule;

Fig. 5 is a longitudinal section throughthe union nut for the needle-holder ferrule;

Fig. is an elevation of the needle;

7 is a longitudinal section on an enlarged scale ot the complete needle-holder, and v Fig. 8 is a longitudinal section on an enlarged scale or" the needle-holder terrule raised to the top of the union nut and in a position which allows the needle to be easily withdrawn by the fingers.

As will be seen in Fig. 3, the washer eX- tractor comprises a metal tube of suitable inside and outside diameters and of an adequate length. At its upper end it is toothed by the provision of recesses m, and at thelower end it is provided with a screw-thread i'. rEhe washer extractor is introduced into the stuiiing-box gland t, and the piston-rod e of the syringe is passed through the washer extractor so that the recesses m engage with lugs p provided on the handle Z of the piston-rod. Then the recesses m and the lugs v are engaged, the rod c is turned and thus causes the screw-thread r on the washer eX- tractor to engage the inner screw-thread in the stu'ting-boz; gland t, whereby the washer extractor is screwed home into the said gland. As soon as this has been done, a' washer al of cork, leather or other material is passed on to the piston-rod and into the interior oi the gland. Finally, the syringe is closed by lirmly screwing the gland t on the outer screw-thread of the cylinder c of the syringe, the latter being then ready for use. When it is necessary to renew the washer Z on account of its having become worn or useless, the syringe is taken to pieces by unscrewing the gland t from the cylinder 0,' the recesses m ot the washer extractor are brought into engagement with the lugs p, and the handle Z is turned so that the washer extractor forces out the washer from the gland however much the said washer may happen to be embedded or wedged in.

The needle A is introduced into the bore of the needle holder errule P, until the soft metal collar Z) on the needle presses against the upper surface or crown of the fel-rule. As soon as this is done, the fer# rule is introduced in the screw-threaded union nut R, and screwed home to the bottom of the said nut. Thus arranged, it is mounted on the syringe, the union nut being screwed on to the screw-threaded part provided on the lower end of the syringe.

For renewing a damaged or broken needle the needle holder is detached from the syringe by unscrewing the union nut R from the latter. The needle holder errule P is then turned and thus caused to rise in the interior ot' the nut Runtil the collar I) of the needle is in the position shown in Fig. 6, whereupon the collar can be held by the iingers, and the needle withdrawn Vwith the greatest ease. In order to preventany escape of the injection liquid, it is advisable that the needle holder ferrule should t perfectly in the union nut, and there are occasions in which it is rather ditlicult to separate them. Therefore in order to facilitate this separation, instead of making the lower part of the terrule of a circular cross-section, it is advisable to make it elliptical or oblong, so that when the nut R is removed from the cylinder c the ferrule P can be introduced into a suitably shapedphole g in the `handle Z and thus can be held while it is screwed into or unscrewed from the union nut. The union nut is provided with wings c1' to facilitate turning.

lVhat I claim as my invention and desire to secure by Letters Patent is zl. A hypodermic syringe comprising a barrel, a stuiiing-box gland screwed thereon, a piston rod passing through said gland and entering said barrel, hollow' needle, a collar thereon, and a needle holder consisting of two parts one of theseparts being a needle-holder ferrule externally threaded and the other a union nut adapted to screw onto the barrel and the external thread on the ferrule, said ferrule being adapted to push the collar on the needle out of the union nut when the -latter is taken off the barrel.

2. A hypodermic syringe comprising a barrel, a stuIing-box gland screwed thereon, a piston rod passing through said gland and entering said barrel, a hollow needle, a collar thereon, and a needle holder consisting of twov parts one or' these being a needle holder ferrule externally threaded and the other a union nut adapted to screw onto the barrel and the external thread on the ferrule, an internal projection being arranged in the bore of the union nut at the end farthest from the barrel.

3. A hypodermic syringe comprising a barrel, a stuiiing-box gland screwed thereon, a piston rod passing through said gland and entering said barrel, a hollow needle, a collar thereon, and a needle holder consisting of two parts one of these parts being a needle holder ferrule externally threaded and the other a union nut with wings adapted to screw onto the barrel and the external thread on the ferrule, said 'errule being adapted to clear the union nut of the collar when the union nut is taken off the barrel.

ln testimony whereof I have signed my name to this speciication in the presence of two subscribing witnesses.

DR. Josn vannnnnxnn.

Vitnesses HENRY MGVEIGH, Louis ZAROPA. 

